Standard type, or in other words, medium duty refractory firebrick is useful for varieties of applications. Different alumina content in firebricks (e.g. in between 38% High Duty and 17% Low Duty firebricks alumina content mark) reflects in different bulk densities plus a few other physical properties and chemical compositions - for the complete list of these, read page refractory firebricks and an article which talks also about additionaldense mass stores more heat.

In principle with any measuring task, switched on professional people always ensure, and their success depends on, they get the most precise conversion results everywhere and every-time. Not only whenever possible, it's always so. Often having only a good idea ( or more ideas ) might not be perfect nor good enough solution. If there is an exact known measure in 担 / 擔 tam - Hong Kong piculs for firebrick 23% alumina amount, the rule is that the Hong Kong picul number gets converted into 錢 tsin - Hong Kong mace or any other firebrick 23% alumina unit absolutely exactly.